Design and field trial measurement results for a portable and low‐cost very‐high‐frequency/ultra‐high‐frequency channel sounder platform for Internet of things propagation research

Ball, Edward

doi:10.1049/iet-map.2018.5827

Cited by 6 publications

(10 citation statements)

References 22 publications

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“…The process should be automated as far as possible in order to reduce the time taken to perform a study. Delay spread has previously been measured in the test area, at the frequencies used in this paper, by one of the authors in [10]. Maximum RMS delay spread was found to be less than 1µs.…”

Section: B Existing Published Approaches To Conducting Propagation Studiesmentioning

confidence: 75%

Highly Portable, Low-Cost SDR Instrument for RF Propagation Studies

Wright

Ball

2020

IEEE Trans. Instrum. Meas.

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Section: B Existing Published Approaches To Conducting Propagation Studiesmentioning

confidence: 75%

Highly Portable, Low-Cost SDR Instrument for RF Propagation Studies

Wright

Ball

2020

IEEE Trans. Instrum. Meas.

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“…There are clearly several strong time domain reflections present on Fig. 13a, spreading across 500 ns (producing an RMS delay spread of 70.2 ns calculated using [2]). The spectral nulls caused by these reflections are seen in Fig.…”

Section: B Indoor Propagation Test Resultsmentioning

confidence: 99%

“…The sounder uses a 511 bit PRBS modulated onto binary phase shift keying (BPSK) transmitted data as the sounding signal. An efficient correlation procedure in the RX using circular convolution and FFTs [2] is used, based on (1).…”

Section: Sounder Algorithmmentioning

confidence: 99%

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A Portable 28-GHz Channel Sounder Platform and Measurement Results From Close-to-Ground Field Tests

Ball

Joseph

2023

IEEE Open J. Instrum. Meas.

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This article describes a novel, bespoke, and low-cost 28 GHz RF TX and RX front end design that has been combined with a commercial Software Defined Radio and Raspberry Pi controller to realize a portable propagation measurement system for the 28 GHz band. The complete sounder system can resolve an impulse from RX powers down to -107 dBm (3 dB impulse SNR) and the sounder TX can generate a signal of -8 dBm. Therefore, using 20 dBi antennas supports path loss measurements of 139 dB. The sounder can resolve time domain reflections to 33 ns in a channel measurement bandwidth of 60 MHz, producing both time domain and frequency domain results. The complete sounding system has been used to perform close-to-ground RF channel measurements, with propagation loss models and time domain impulses extracted. Close-to-ground measurement is an underreported area of propagation research that is relevant for novel use-cases, such as in military applications or for mobile device-to-device communications. A key initial finding from the trials is that the path losses for 28 GHz indoor and outdoor links at circa 70 cm above ground seem close to that of free space, with very few strong reflections with delays exceeding 33 ns.

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“…To the best of author's knowledge, this proposed work is the first investigation into millimeter-wave close to ground propagation in rural outdoor environments. However, in [39] as the work mainly dealt with testing of the developed sounder, more realistic scenarios with extensive measurements from different terrains are investigated in this work. The study extracted large-scale path loss, time domain impulses, and channel responses from measured data, and presenting log-normal models for various terrains.…”

Section: Introductionmentioning

confidence: 99%

28-GHz Rural Close-to-Ground Propagation Field Test Results and Models

David Joseph,

Gavin,

Ball

2024

IEEE Open J. Antennas Propag.

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A set of 28 GHz close-to-ground propagation measurements are conducted for different rural outdoor scenarios at the National Spectrum Centre, Aberystwyth. A bespoke correlation based channel sounder and horn antennas are employed in the measurement system. The measurements provide large-scale path loss, time domain impulses and channel measurements that will be beneficial for rural future millimeter wave communication systems. Different scenarios, such as straight and elevated paths, zig-zag curved road and curved road in woods are explored and log-normal models are extracted. Propagation measurements in diverse terrains including hill, grass land, dense forest and buildings are also conducted. The path loss predictions of existing foliage loss models like Weissberger , ITU-R, COST and FITU-R are investigated with frequency and distance. Then, the measured path losses are compared with these models. Predicted pathloss values of these models are overestimated at 28 GHz in dense tree forest after 50 m. Strong reflections are observed in the propagation through buildings at log(d) distance of 1.6 and 1.9. Similar path loss attenuations and fixed offset values (nearly 22 dB more than free space) are observed in the propagation through the dense forest and curved road in woods. The presented close-to-ground propagation research is significant for future military applications and mobile device-to-device communications.

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Design and field trial measurement results for a portable and low‐cost very‐high‐frequency/ultra‐high‐frequency channel sounder platform for Internet of things propagation research

Cited by 6 publications

References 22 publications

Highly Portable, Low-Cost SDR Instrument for RF Propagation Studies

Highly Portable, Low-Cost SDR Instrument for RF Propagation Studies

A Portable 28-GHz Channel Sounder Platform and Measurement Results From Close-to-Ground Field Tests

28-GHz Rural Close-to-Ground Propagation Field Test Results and Models

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